Schedule of Changes in Balance Sheet Position of Employee Related Restructuring Reserves (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Reserve at end of the period	$ 99.6		$ 99.6
Restructuring employee-related
Restructuring Cost and Reserve [Line Items]
Reserve at beginning of the period	52.1	$ 28.5	56.1	$ 33.4
Provision - charge	69.2	12.9	70.9	13.7
Provision - reversal	(7.3)		(7.4)	(0.1)
Cash payments	(16.0)	(1.4)	(20.4)	(6.5)
Translation difference	1.6	0.3	0.4	(0.2)
Reserve at end of the period	$ 99.6	$ 40.3	$ 99.6	$ 40.3

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

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Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve.

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